jugoslav

The answer may help you to make a question more detailed. 

∠ABC + ∠BCD + ∠CDE + ∠DEF = 540º

No problem; I appreciate your answers.

A circle has a radius of 25. A circular sector, with an angle of 345.6 degrees at the center, is cut from the circle, and then rolled to form a cone. Find the volume of the cone.

r = {[(50 * pi / 360) * 345.6] / pi} / 2

r = 24

h = sqrt(25² - 24²) 

h = 7

V = pi*r²*h / 3 = pi*24²*7 / 3 = 4222.3 u³   or   1344pi u³

In triangle ABC, AB=5, AC=6, and BC=9. Circles are drawn with centers A, B, and C so that any two circles are externally tangent. Find the sum of the areas of the circles.

Let AF be x

x / 12-x = 18 / 12 

x = ?

LINK:::::https://web2.0calc.com/questions/help_54234#r3

AX = 2       CX = 0.5

BX / 2 = 0.5 / BX

BX = 1

ABCDEFGHIJ is a regular decagon. The rotation centered at G with an angle a takes D to J. Given that a is less than 180 degrees, find a. 

corrections:::    the measure of angle E is 34.36º

 In concave equilateral pentagon ABCDE, Angle A is equal to Angle B is equal to 105 degrees. What is the degree measure of angle E?